KR100353707B1 - Method and apparatus for providing internet protocol service in asynchronous transfer mode network - Google Patents

Abstract

The present invention provides a method for providing an Internet protocol service in an asynchronous mode network including a plurality of nodes serving an asynchronous transmission mode. When the Internet protocol service request is made with a destination Internet protocol address, the request is received from the plurality of nodes. Forming a specific signaling link separate from a signaling link in the plurality of nodes using a service access point reserved by a source node, and the source node is asynchronous to correspond to the destination Internet protocol address. Searching for a transmission mode address based on a preset address mapping table, and forming a routing channel from the service requester to a destination node using the found asynchronous transmission mode address and the specific signaling link.

Description

Method and apparatus for providing Internet protocol service in asynchronous transmission mode network {METHOD AND APPARATUS FOR PROVIDING INTERNET PROTOCOL SERVICE IN ASYNCHRONOUS TRANSFER MODE NETWORK}

The present invention relates to an asynchronous transfer mode (hereinafter referred to as "ATM") network, and more particularly to a method and apparatus for providing an Internet Protocol (IP) service in an ATM network.

Asynchronous Transfer Mode (ATM) is a high-speed packet switching technology that uses a 53-byte fixed length cell to achieve very low latency in a switching system. ATM can be applied to both local area network (LAN) and wide area network (WAN). At present, much attention is being paid to the application of local area and campus network. In the future, if ATMs continue to be installed and supplied, the distinction between LAN and WAN will disappear, supporting seamless network deployment under one ATM standard. Current user demand for bandwidth outpaces the capabilities of traditional shared medium networks, and development of applications that rely on interactive technology is underway. In addition, the increasing use of electronic publishing and video conferencing systems, along with the use of multimedia applications and powerful desktop workstations, requires the need for dedicated band widths from the user's personal computer to the WAN. To meet these requirements, many companies are adopting high-speed, media-sharing LAN technologies such as Fiber Distributed Data Interface / Copper Distributed Data Interface (FDDI / CDDI), Fast Ethernet, or 100VG-AnyLAN, and in some cases LAN switches or ATM- We are considering the best choice of LAN technology based on switches such as LAN.

On the other hand, ATM private networks based on PNNI (Private Network-Network Interface) are routed with a 20 byte NASAP (Network Service Access Point) addressing system. PNNI is based on source routing, and calculates the route from source ATM node to destination ATM node and stores it in DTL (Designated Transit List) to provide service for call establishment message requested by user.

However, the address system in ATM private network has a NSAP structure of 20 bytes, so it cannot provide IP service. And while private ATM switching network is connection-oriented service, IP service is connectionless service. Therefore, there is a problem when a LAN service such as Ethernet is used or an IP service is used in a network composed of ATM private networks.

Accordingly, an object of the present invention is to provide a method and apparatus for receiving IP services in an ATM private network.

Another object of the present invention is a method of transmitting basic information from a network management system (NMS) in the form of IP service in an ATM private network to a destination ATM node in the existing IP service format without affecting the service provided by the ATM network. And to provide an apparatus.

In accordance with the above object, the present invention provides a method for providing an internet protocol service in an asynchronous mode network including a plurality of nodes serving an asynchronous transmission mode service. Forming a specific signaling link separate from a signaling link of the plurality of nodes by using a service access point reserved by a source node requested by the node; and the source node is connected to the destination Internet. Searching for an asynchronous transmission mode address corresponding to a protocol address based on a preset address mapping table, and forming a routing channel from the service requester to a destination node using the found asynchronous transmission mode address and the specific signaling link; Characterized by Shall be.

1 is a block diagram according to an embodiment of the present invention;

2 is an operation procedure diagram according to an embodiment of the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a block diagram according to an embodiment of the present invention. In FIG. 1, the source node 10, the transit node 20, and the destination node 30 may be ATM private exchanges, each of which may be an ATM private network. Included. NMS (Network Management System) (40) checks for the abnormality of various equipments with different roles through a standardized protocol. Currently, the standardized management protocol can consider two types, namely, Simple Network Management Protocol (SNMP) and Common Management Information System / Protocol (CMIP), all of which are in the form of IP services.

In the embodiment of the present invention, in the ATM private network as shown in FIG. 1, basic services (information for remote management) from the NMS 40 in the form of IP service are not affected by the service provided by the existing ATM switching network. Instead, it is transmitted to the destination node 30 in the existing IP service format. In other words, it is to implement IP service in ATM private network.

As disclosed in the prior art, since the IP address and ATM address systems are different, the IP address and the ATM address must be mapped in order to provide IP services in the ATM private network. To this end, each node 10, 20, 30 of FIG. 1, that is, each ATM private exchange is assigned an IP address. For example, the source node 10 may be assigned an IP address as "128.68.35", the forwarding node 20 as "128.68.45", and the destination node 30 as "128.68.55". Each of the assigned IP addresses is preset in the NMS 40, and the management IP blocks 12, 22, and 32 of the nodes 10, 20, and 30 are assigned IP addresses and corresponding nodes. (ATM exchanges) 10, 20, and 30 have an address mapping table that maps the ATM addresses.

The source node 10 of each of the nodes 10, 20, and 30 finds an ATM address corresponding to the destination IP address using an internal address mapping table when the destination IP address comes from the NMS 40. Thereafter, routing is performed based on the found ATM address (that is, routing to the IP address required by the destination NMS 40). In this case, routing table information provided by the PNNI block 14 is used.

Private Network-Network Interface (PNNI) is a protocol that allows ATM signaling information to be routed between ATM switches. It consists of PNNI signaling and PNNI routing. PNNI signaling is responsible for the relaying of call establishment requests between nodes (ATM exchanges), establishing a one-to-one and one-to-many connection. At the source node (ATM exchange) requiring call setup, the corresponding User Network Interface (UN) signaling information is mapped to NNI (Network Node Interface) signaling information, which in turn is converted to UNI signaling information at the destination switch to the destination. Will be reached. This protocol is based on UNI signaling and is configured by adding information related to NNI. The VCI (Virtual Channel Identifier) uses 5 as with the UNI, but the VPI (Virtual Path Identifier) is determined according to whether the PNNI link is a physical link or a virtual link. Additional features include source routing, crankback, and alternate routing of call setup in case of connection failure. PNNI routing is responsible for distributing network topology information between switches or groups of switches. Hierarchy is adopted to cover the global ATM network, and PNNI topology and routing uses link-state routing. It has a structure similar to the existing connectionless routing protocol. The PNNI blocks 14, 24, and 34 present in the nodes 10, 20, and 30 of FIG. 1 perform the PNNI function as described above, that is, the PNNI signaling function and the PNNI routing function. In the example, the routing table information obtained from the routing table of the PNNI blocks 14, 20, and 34 is periodically provided to the management IP blocks 12, 22, and 32 in consideration of the PNNI dynamic network situation.

Typically, the PNNI blocks 14, 24, 34 of each of the nodes 10, 20, 30 form the signaling link first as PNNI signaling when the nodes 10, 20, 30 are booted and then as PNNI routing. Form a routing channel.

In an embodiment of the present invention, in order not to affect the existing signaling link and the PNNI routing channel at each node 10, 20, and 30, a specific signaling link is set separately from the existing signaling link, The signaling link is used to transmit basic information (information for remote management) of the NMS 40 to the destination. There are 1024 VCs per VP. In the present invention, for example, the VPI may be any number from 1 to 24, and the VCI uses 511 to establish a specific signaling link. Normally, VCI recommends using # 5. In order to establish such a specific signaling link, each of the nodes 10, 20, and 30 are provided with corresponding ATM stacks 16, 26, and 36, respectively. Each of the ATM stacks 16, 26, and 36 is composed of a physical layer unit (PHY), an ATM layer unit (ATM), and an AAL5 layer unit (AAL5). AAL5 layer unit (AAL5) A number (eg, about 24) signaling SAP (Service Access Point) is reserved. For example, if VPI = 1 and VCI = 511, VPI = 2 and VCI = 511, ..., VPI = 24 and VCI = 511, 24 signaling SAPs are reserved.

SAP is an address used for Open System Interconnection (OSI), which is located at each layer and is used for the following purposes. When an application initiates an outgoing call to a remote ATM device, the destination SAP specifies the ATM address of the remote device, as well as the address identifying the target software entity within the remote device. (2) When an application prepares an incoming call response from a remote ATM device, the local SAP specifies the ATM address of the device composing the application, as well as the address identifying the application within the local device.

The SAPs reserved for the AAL5 layer unit (AAL5) are allocated one by the AAL5 layer unit (AAL5) to establish a specific signaling link whenever there is a call connection establishment request including the destination IP address from the NMS 40. do. The assigned specific signaling link is up or down together depending on when the existing PNNI signaling link is up (live) or down (dead). The assigned specific signaling link is also formed only after the existing signaling link is formed. It is to be understood that the assigned specific signaling link is labeled " SLk " in FIG. 1, and that the existing PNNI signaling link and PNNI routing channel are not shown in FIG.

2 is an operation procedure diagram according to an embodiment of the present invention. The following will be described with reference to FIG. 2 to more clearly describe the operational flow of the present invention.

First, in step S100, each of the nodes 10, 20, and 30 reserves a predetermined number (eg, 24) of signaling SAPs to use a specific signaling link separate from the existing signaling link at initialization. . As shown in the previous example, 24 signaling SAPs can be reserved with VPI = 1 and VCI = 511, VPI = 2 and VCI = 511, ..., VPI = 24 and VCI = 511. have.

Subsequently, in step S110, when the NMS 40 sets the call connection establishment request including the IP address (destination IP) of the destination node to be remotely managed as the source node 10, the source node 10 in step S115. One of the reserved SAPs provided by the AAL5 layer AAL5 is allocated to establish a specific signaling link as shown in FIG. 1. Thereafter, the source node 10 searches for an ATM address corresponding to a destination IP address included in the call connection establishment request in step S120 using an address mapping table, and periodically in the PNNI block 14 with the ATM address found in step S130. The routing channel from the NMS 40 to the destination node 30 is formed on the basis of the routing table information provided.

When the routing channel is formed in this way, information for remote management of the NMS 40 is transmitted to the destination node through the formed routing channel as in step S140.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

As described above, the present invention enables remote network management even where IP service such as ATM private network is not supported, and the NMS based on IP service can set basic information (information for remote management) for ATM switch. .

Claims (7)

In the method of providing an internet protocol service in an asynchronous mode network including a plurality of nodes serving an asynchronous transmission mode, and establishing a path with a connection-oriented network service access point address system, Allocating an internet protocol address to each of the plurality of nodes; Internet Protocol Service System When a network management device makes an Internet Protocol service request for remote management with an unconnected destination Internet Protocol address, a source node receives a service request from the destination Internet protocol address among the plurality of nodes. Process, The source node receiving the service request at the destination Internet protocol address is different from the existing PNNI signaling link for the asynchronous transmission mode service in the plurality of nodes using a service access point prepared in advance for establishing a specific signaling link. Forming a separate specific signaling link, The source node searches for an asynchronous transmission mode address corresponding to the destination Internet protocol address based on a preset address mapping table therein, and uses the found asynchronous transmission mode address and the specific signaling link to the destination node from the service requester. A method of providing an Internet protocol service in an asynchronous mode network, characterized in that the routing channel is established and the remote management service information is transmitted to the destination node in the form of an Internet protocol. A method of providing an internet protocol service in an asynchronous mode network including a plurality of nodes serving an asynchronous transmission mode, Mapping each of the internet protocol addresses corresponding to each of the asynchronous transmission mode addresses of the nodes to the node in an address mapping table; Forming, by a source node, a specific signaling link separate from the signaling links of the plurality of nodes by a call connection establishment request including a destination Internet protocol address from an internet protocol service system network management apparatus; The source node searches for an asynchronous transmission mode address corresponding to a destination Internet protocol address from the network management device based on the address mapping table, and searches the routing table information according to the specific signaling link with the found asynchronous transmission mode address. A method of providing an internet protocol service in an asynchronous mode network, characterized in that the routing channel to a destination node is established based on the basis. The method of claim 2, further comprising transmitting information from the network management apparatus to a destination node through the routing channel after the routing channel is formed. 3. The method of claim 2, wherein a signaling service access point is prepared in the AAL5 layer of the protocol stack of each node in order to form the specific signaling link. 5. The method of claim 4, wherein dozens of service access points are reserved in the AAL5 layer unit. An apparatus for providing an internet protocol service in an asynchronous mode network including a plurality of nodes serving an asynchronous transmission mode, A network management apparatus which is an Internet protocol service system and performs network management including the plurality of nodes; Each of the plurality of nodes maps each of the Internet protocol addresses corresponding to each of the asynchronous transmission mode addresses of the nodes into an address mapping table, and a call connection establishment request including a destination Internet protocol address from the network management apparatus. And forming a specific signaling link separate from the signaling links in the plurality of nodes, and searching for an asynchronous transmission mode address corresponding to the destination Internet protocol address based on the address mapping table. A management internet protocol unit for forming a routing channel to a destination node based on routing table information along the link; And a private network-network interface unit provided in each of the plurality of nodes and providing the routing table information. 7. The method of claim 6, further comprising a protocol stack that reserves a plurality of signaling service access points for use in forming a specific signaling link separate from the signaling link at the plurality of nodes. Internet protocol service providing device in asynchronous mode network.